Indoor climbing, Boulderhaus Heidelberg

Very nice and sociable bouldering place. _5.50 per entrance, they have monthly passes but I'm not sure of the cost. Renting shoes and chalkbag is possible.
Very generous opening hours. Interesting international crowd.
The place is heated, the temperature is comfortable even when it's subzero outside. Showers and changing rooms are present, although NO lockers, people will leave their bags and coats around, I doubt anything bad can ever happen.
The boulders are very good with loads of variety. Very nice slabs as well as perfectly horizontal roofs. Unluckily no V grading (although general guidance is given) and, possibly even worse, no campus board or fingerboards to train on. They do have a slackline, though.